Safety attachment for drop-hammers, &amp;c.



, B. BREARLEY. SAFETY ATTACHMENT FOR DROP HAMMERS, m.

APPLICATION FILED JAN.27, 1912.

1,030,381, v Patented June 25, 19 12.

WiTNESSES INVENTOR.

aw; 9M2:

Ben Frearlay,

safety-stop, as it may be termed, adapted, in case of abnormal action ofthe hammer, as for example, upon a breakage of the ham{ 'tially'withFigs. 1

BEN B'REARLEY, OF PROVIDENCE, RHODE ISLAND SAFETY ATTACHMENT FORDROP-HAMMERS,-&c.

Specification of Letters Patent.

Application filed January 27, 1912. Serial No. 673,856.

To all whom it may concern:

Be it known that I, BEN BREARLEY, a subject of the King of GreatBritain, residing at Providence, .in the county of Providence and Stateof Rhode Island, have invented -certain new and useful Improvements inSafety Attachments for Drop-Hammers, &c., of which the following is aspecification.

This invention relates to a safety device adapted to be attached todrop-presses,' or drop-hammers, as they aresometimes called, and itconsists substantially in the novel construction, arrangement andcombination of parts, all as hereinafter set forth and claimed.

In drop-forging machines, or other analogous machines of this generaltype, the ver tically movable hammer .or amping member is liable toaccidentally or prematurely drop; sometimes this happens before the diesare fully positioned or adjusted, resulting in injury to the workman,and in some cases causing injury to the dies or even to the stockitself.

The objectI have in View is to render drops or presses equipped. with my1nvention practically incapable causing accidental in ury. In otherwords, I provlde the machine with a simple, semi-automatic mersliftingstrap or belt while it is being elevated, or even when the hammeris pre maturely dropped, whereby the self-positioned interposed stop isadapted to arrest the hammer in its downward movement.

- In the accompanying'sheet of drawings, Figure 1 represents, infrontelevation, portions of a drop-hammer machine equipped with myimproved safety-stop, the hammer beingin normal working'action; the stopat the same'time being in the locked rearward position; Flg. 2 1s acorresponding top plan view, in 'enlarged'scale, the dotted lines in-'dicate the extreme inward position the stop would automatically assumewhen it is released, and thehammer omitted or positioned above it; Fig.3 is a frontelevation, in partialsection, corresponding subst'an and 2;Fig. 4 is a partial side elevation, viewed from the left of Fig.

' 3. The stop device, however, in this figure is represented in thenormally released position, corresponding with'the dotted line po bersof sition of the stop indicated in Fig. 2; Fig. 5 1s a side elevationshowing portions of the machine, viewed from the back;'and Fig". 6 isapartial sectional view of'the locking and tripping device, ing withthat shown in Fig. 2.

I may state that the safety attachment forming the subject of thisapplication for patent is more particularly devised for use PatentedJune 25, 1912.

its position correspond lnconnection with metal swaging or forgingmachines in which the hammer is capable ofbeing released from itselevated position'by the operator-or even automatically swhereby theforce or impact of the hammer-blow upon striking the suitably positionedstock, in cooperation with the die or surface on which it is supported.causes the stock to be correspondingly transformed, in a well-knownmanner.

Referring to the drawings, a, b, and i1 lnd cate, respectively, the bedor anvil, the uprights or guides, and the hammer mema drop of usualconstruction. llhe ad acent faces of the anvil and hammer may be adaptedto receive die {holders d. The drawing also represents the verticallvmovable hammer member slidably mounted between the ways of thefuprightsand con-- nectcd to a strap which the hammer Means for liftingandreleasing the hammer are not shown, since mechanism for this or fiatbelt 6, through purpose are well-known and therefore not.

deemed essential to this specification.

The following 1s a more detailed ortiscripe tlOIl of the stop device andthe marner is adapted to be elevated.

of its operation :-The stop proper A, of

suitable dimensions, is arranged to auto-' matically swing onto the faceof the dieholder d or. other surface disposed-below and in alinementwith the hammer. The ends of the stop are counterbored or otherwiseadapted to receive plugs oof rawhide or other-substance possessingadegree of resiliency. Integral with the stop are arranged arms ff,terminating in a vertical hub 2' mounted to vibrate on a headed poststapped into a stud 7c, in turn secured to the anvil a--see Figs. dand 5.A set-screw ng? engaging the lower or screw-threaded por: tion of thepost, connection with a spring 8 interposed between the ad acent facesof said hub and stud, serve to maintain these;

parts in yielding vertical adjustment... The

upper end of the stops hub i has a short lateral arm 7 arrangedsubstantially oppo- ,'the stop is actuated.

site'the arms f, having. a vertical pin 1n fixedto its outerend, throughwhich-latter A manually operable'jpul l-rod m, liaving a reduced portionm extends transversely through one oflthe uprights b. To the rear end ofthe roldiis secured a flanged,- ear m jointed tothe said' vertical pinW. A spring 8, mounted on the part m} of the rod m an consisting of alight spring .3 acts to mainsitioned between the "upright and said ear,1s adapted'to' automatically swing the stop to the extremeinwardposition'when the latch-member 5c, pivoted. at 0 to-the front of theupright, is temporarily disengaged from the portion m of'the roF n;means V tain the latch in yielding contact with the the hammer thereon,

pull-rod, as clearly shown. It may be stated that the stop, when in thereleased position, is adapted to temporarily support cated in Fig. 4:.Now, assuming that the several parts of the drop-forging machine orpress and the safety-stop attachment have been properly adjusted andadapted for normal operation, whereby the hammer h, upon being released7 by the operator, will, in its descent to transform the stockpositioned therebelow, engage the inner arm v of the tiltable,springpressed latch a (previously actuated by the operator to-swing andlock the stop A in the rearward position), and trip or release the latchJfrom the endwise movable springpressed pull-rod,.thereby at the sametime permitting the spring 8 to move the stop inwardly ,to yieldingly.bear against the back he hammer) arrives. at a state of rest. Fig. 2represents ofthe hammer before it the normallylocked-stop before it hasbeen thus released by the downwardly moving.

. hammer. After the blow has. been delivered the hammer, itself is movedupward .and supported at any desired height in a well {known way. Duringsaid upward movement the spring scauses the-stop to.

swing inwardly and freely to its limit, thereby for the time beingpositioning it below and [in alinementwith the hammer, the stop anvil ordie-holder.

then practically resting upon the face of the ber Aautomatically swingsunder the hammer just after the latters base passes above the upper endof the stop. The-dotted lines in; Flg. 2, also Fig. 4, indicate thecorresp/ondrng position.- The attendant next, af-

' ter performing the necessary oper ons 1n- .cident to the normal actionof the machine,

" part m substantially as indi-- Obviously, the mem-.

until released-see Figs. 3 and 6. It may be added that said movementoftlie latch places the other arm'c in normal position again. Theseveral elements now being in V the normal positions, the operator nextreleases .the supported elevated hammer, which,.in falling to make thestampingblow, engages the latch and automatically trips it, thereby,too,releasing the stop and permitting it to engage the back of the hangmer, as before-described. In case, however? the operator fails tomoveand lock the stop in the retracted position before he releases theupwardly supported hammer, the latter will, when released, fall on thestops end instead of completing its normal stroke and blow. in the usualpractice of setting 'or adjusting the dies in drop machines of thisclass, preparatory tonormal working, the.

operator places a shortwooden block on the anvil for the hammer to restupon during the die-adjustment process. The block is removed andreplaced duringeach of the tentative strikes of the hammer; the workman,insuch die-setting tests, simply elevates the hammer a distanceslightlyexceeding the height of the block. If he fails to thus replace the blockbefore the next succeeding-blow, his hand or'fingers are liable to beaccidentally caught and severely injured. My improved safety-stop iswelladapted to be thus employed in lieu of the wooden blocks. In suchcase the stop auto- I matically swings under the hammer after eachtentative strike or reduced blow,tl1ereby avoiding the liability ofaccident to the operator, assuming, of course, that he moves and locksthe stop A 'n the retracted posh tion prior tov releasing-the hammer tomake 'said reduced blow. The hammer,

trips the stop so that it=will automativ in fallcallyswing inwardly 1nposition to support it after the next upward stroke of the hammer ismade. p y

I claim as my invention and desire to secure by S. Letters Patent 1. Ina safety-stop device for drop hammers oranalogous machine, a movablestop member disposed with relation to the hammer, means for holding thestop in the normally retracted position, means, capable of beingactuated by the hammer in its descent, for tripping or releasing thestop, and means provided for automaticallymoving the released stopinward between the anvil and hammer].

2. Inta drop-hammer or analogous machine, the combination with the anviland a guided,gvertically movable hammer disposed above the top face ofthe anvil,'of a safetystop device having a springi pressed member,constitutin the stop pr 'oper, means for normally lockmg 1t in positionwith relation to the hammer, and tripping means adapted to be engaged bylaterally movable,

the hammer for releasing the saidstoi),

Whereby fitgis adapted to m'gve under the hammer, automatically when theletter is misedeg'distance exceeding the height of vide fixed to saidmachine, 10

v the stop;

C opies ef this patent may be gbtained for eapa-ble of being-tripped bythe'hammer forfive cents eatiz, by addressing Washington, D. 0,.

releasing the stop from said retracted position, whereby it is adaptedto 'automaticaIly move inward under the hammer while the latter-is beingelevated, and manually con-, trolled means for returning and locking thestop in the seid'normal retracted position.

In testimony whereof I have affix'ed' my 20 signature in presence of twoWitnesses.

BEN BREARLE Y.

, wYvitnesses I GEO.-H. REMINGTON,

, 'JQHN JAMES COUPE.

the commissionel of Patents,

